linux-kernel - [PATCH 5.4 058/244] s390: fix detection of vector enhancements facility 1 vs. vector packed decimal facility

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Message-Id: <20210512144744.902512076@linuxfoundation.org>
Date:   Wed, 12 May 2021 16:47:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vasily Gorbik <gor@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: [PATCH 5.4 058/244] s390: fix detection of vector enhancements facility 1 vs. vector packed decimal facility

From: David Hildenbrand <david@...hat.com>

commit b208108638c4bd3215792415944467c36f5dfd97 upstream.

The PoP documents:
	134: The vector packed decimal facility is installed in the
	     z/Architecture architectural mode. When bit 134 is
	     one, bit 129 is also one.
	135: The vector enhancements facility 1 is installed in
	     the z/Architecture architectural mode. When bit 135
	     is one, bit 129 is also one.

Looks like we confuse the vector enhancements facility 1 ("EXT") with the
Vector packed decimal facility ("BCD"). Let's fix the facility checks.

Detected while working on QEMU/tcg z14 support and only unlocking
the vector enhancements facility 1, but not the vector packed decimal
facility.

Fixes: 2583b848cad0 ("s390: report new vector facilities")
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Signed-off-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Reviewed-by: Janosch Frank <frankja@...ux.ibm.com>
Link: https://lore.kernel.org/r/20210503121244.25232-1-david@redhat.com
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/s390/kernel/setup.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -922,9 +922,9 @@ static int __init setup_hwcaps(void)
 	if (MACHINE_HAS_VX) {
 		elf_hwcap |= HWCAP_S390_VXRS;
 		if (test_facility(134))
-			elf_hwcap |= HWCAP_S390_VXRS_EXT;
-		if (test_facility(135))
 			elf_hwcap |= HWCAP_S390_VXRS_BCD;
+		if (test_facility(135))
+			elf_hwcap |= HWCAP_S390_VXRS_EXT;
 		if (test_facility(148))
 			elf_hwcap |= HWCAP_S390_VXRS_EXT2;
 		if (test_facility(152))